A strong earthquake in Japan is a crack in the bottom of the ocean


10/12/2011

Terrible disaster that struck in March 2011 on the shore of Japan, was responsible for the formation of deep crevices 3 meters wide at the bottom of the ocean, as shown by a new study by Japanese scientists. A large crack lay a scar on the bottom of the ocean, which is home to only peaceful clams, according to information Tsuzhi Takeshi (Takeshi Tsuji), researchers from the University of Kyoto in Japan.

Along with seismic studies, cleft were detected by dipping the bottom of the ocean engineering manual that exploring it after the earthquake, showed how the earth’s crust is stretched and cracked around the epicenter of the quake.

We Tsuzhi and his colleagues had a unique opportunity to see what changes have occurred in the bottom of the ocean after a strong earthquake with a capacity of 9 points, which happened on March 11 this year. Before the earthquake, researchers made a video and photograph the ocean floor from the continental side of the Japan Trench, near the spot where later the crust was fractured, generating a huge devastating tsunami that killed about 20,000 people.

The video frames can be seen quiet bottom of the ocean, peace is sometimes disturbed only by occasional beds of clams, according Tsuzhi this month at the annual meeting of the American Geophysical Union (AGU). After the earthquake, however, on the sea floor have been seen signs of major changes, the consequences of action vast natural forces.

Approximately 3200-5350 meters below the ocean’s surface, the researchers found an open cleft in "many places", as reported Tsuzhi. Crack length varied from about 1 to 3 meters and a depth of researchers have not measured.

By combining their direct observations with seismic surveying the ocean floor, researchers have discovered a series of complex defects located around the area where the continental crust of the coast of Japan is under pressure of the tectonic plates of the Pacific Ocean. They found that when the core is cracked to a depth of about 20 miles below the surface of the planet, this process was not powerful enough to form crevices on the surface. This fault pushed a large section of the bottom of the ocean, which in turn triggered a huge tsunami that devastated the coast of Japan.

Meanwhile, the province crust where the earthquake was not only pushed outward, but also stretched horizontally like an accordion, as noted Tsuzhi. This explains why education fissures have appeared as a result of stretching of the crust.

Original: LiveScience


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